黑龙江快乐十分

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常见问题

液下泵的基本参数

来源: 时间:2019-02-20 15:48:56 次数:

(1)流量Q 流量是液下泵在单位时间内输送的液体量(体积或质量)。 体积流量以Q表示,国际单位是:m3/s,工程中常用的还有m3/h、L/s等。 质量流量以Qm表示,国际单位:kg/s,工程中常用的还有L/h等。 质量流量和体积流量的关系为 Qm=ρQ (7-1)

 (1)LIULIANGQ  LIULIANGSHIYEXIABENGZAIDANWEISHIJIANNEISHUSONGDEYETILIANG(TIJIHUOZHILIANG)。

    TIJILIULIANGYIQBIAOSHI,GUOJIDANWEISHI:m3/s,GONGCHENGZHONGCHANGYONGDEHAIYOUm3/h、L/sDENG。

黑龙江快乐十分     ZHILIANGLIULIANGYIQmBIAOSHI,GUOJIDANWEI:kg/s,GONGCHENGZHONGCHANGYONGDEHAIYOUL/hDENG。

黑龙江快乐十分     ZHILIANGLIULIANGHETIJILIULIANGDEGUANXIWEI

    Qm=ρQ    (7-1)

黑龙江快乐十分 SHIZHONGρ—YETIDEMIDU(kg/m3);

    Q—TIJILIULIANG(m3/h)o

    (2)YANGCHENGH  YANGCHENGSHIZHIYEXIAYEXIABENGSUOCHOUSONGDEDANWEIZHONGLIANGYETITONGGUOYEXIAYEXIABENGHOUHUODEDENENGLIANG,YIHBIAOSHI,DANWEISHIm。

    YANGCHENGSHIYIGENENGLIANGZENGLIANGDEGAINIAN,WEIDANWEIYETICONGYEXIAYEXIABENGJINKOUFALANCHU(YEXIABENGJINKOU)DAOCHUKOUFALANCHU(YEXIABENGCHUKOU)SUOHUODEDENENGLIANGZENGLIANG。

    YEXIABENGDEYANGCHENGKEYIBIAODAWEI

黑龙江快乐十分     H=E2-E1   (7-2)

黑龙江快乐十分 SHIZHONG  E2—YEXIABENGCHUKOUCHUDANWEIZHONGLIANGYETIDENENGLIANG(m);

      E1—YEXIABENGJINKOUCHUDANWEIZHONGLIANGYETIDENENGLIANG(m)。

黑龙江快乐十分 DANWEIZHONGLIANGYETIDENENGLIANGZAISHUILIXUEZHONGCHENGWEISHUITOU,YOUWEIZHISHUITOUZ、YALISHUITOUP/ρgHESUDUSHUITOUv2/2gSANBUFENZUCHENG,JI:

E2=p2/ρg+v22/2g+z2

E1=p1/ρg+v21/2g+z21

SHIZHONGP2、P1—YEXIABENGCHUKOU、JINKOUCHUYETIDEJINGYALI(Pa);

    V2、V1—YEXIABENGCHUKOU、JINKOUCHUYETIDESUDU(m/s);

黑龙江快乐十分     z2、z1—YEXIABENGCHUKOU、JINKOUCHUZHIYEXIABENGCELIANGJIZHUNMIANDEJULI(m);

        ρ—YETIMIDU(kg/m3);

         g—ZHONGLIJIASUDU(m/s2)。

  YINCI,YEXIABENGYANGCHENGWEI

黑龙江快乐十分    H=E2-E1=(P2-P1)/ρg+(v22-v12)/2g

    YEXIABENGYANGCHENGBIAOZHENGYEXIABENGBENSHENDEXINGNENG,ZHIYUYEXIABENGJINKOU、CHUKOUCHUDEYETINENGLIANGYOUGUAN,ERYUYEXIABENGZHUANGZHIWUZHIJIEGUANXI。DANKELIYONGZHUANGZHIZHONGYETIDENENGLIANGJISUANYEXIABENGDEYANGCHENG。

    (3)ZHUANSUnZHUANSUSHIYEXIABENGZHOUDANWEISHIJIANNEIDEZHUANSHU,DANWEIWEIr/min。

黑龙江快乐十分     (4)GONGLV

黑龙江快乐十分     1)SHURUGONGLVPa:YEXIABENGGONGLVTONGCHANGZHISHURUGONGLV,JIYUANDONGJICHUANDAOYEXIABENGZHOUSHANGDEGONGLV,GUCHENGZHOUGONGLV。SHURUGONGLVYIPaBIAOSHI,GUOJIDANWEIWEIW,GONGCHENGSHANGCHANGYONGkW。

黑龙江快乐十分   2)YOUXIAOGONGLVPM:ZHIDANWEISHIJIANNEICONGYEXIABENGZHONGSHUSONGCHUQUDEYETIZAIYEXIABENGZHONGHUODEDEYOUXIAONENGLIANG,YOUCHENGSHUCHUGONGLV。YOUXIAOGONGLVGUOJIDANWEISHIW,GONGCHENGSHANGCHANGYONGkW,CHANGCHENGSHUI(YE)GONGLV。

黑龙江快乐十分     PM=ρgQH   

SHIZHONG  Q—YEXIABENGSHUSONGYETILIULIANG(m3/h);

        H—YEXIABENGYANGCHENG(m);

       ρ—YETIMIDU(kg/m3);

        g—ZHONGLIJIASUDU(m/s2)。 

    (5)YEXIABENGXIAOLVη YEXIABENGXIAOLVDINGYIWEIYEXIABENGYOUXIAOGONGLVYUZHOUGONGLVZHIBI。YEXIABENGDEZHOUGONGLVYUYOUXIAOGONG

黑龙江快乐十分   LVZHICHAWEIYEXIABENGNEIDESUNSHIGONGLV,QIDAXIAOYONGYEXIABENGDEXIAOLVLAIJILIANG。YEXIABENGXIAOLVYIηBIAOSHI

   η=Pu100%/Pa=ρgQH100%/Pa

    (6)BIXUQISHIYULIANGNPSHr NPSH(Net Positive Suction Head)SHIJINGZHENGXIRUSHUITOUDEYINGWENSUOXIE。

    NPSHrCHENGBIXUQISHIYULIANG。NPSHrWULIYIYISHIZHIYEXIABENGJINKOUDAOYEPIANBEIMIANZUIDIYALICHUNENGLIANGSUNSHI,DANWEISHIm。

    NPSHrSHIYEXIABENGGUYOUDETEXING,ZHIQUJUEYUYEXIABENGBENSHEN,YUWAIBUDEZHUANGZHIWUGUAN。

黑龙江快乐十分 NPSHrSHITONGGUOSHIYAN,ANZHAOYIDINGDEXINGNENGBIANHUAYUEDINGHUODE。ZHEIZHONGYUEDINGKEYISHIHETONGGUIDING,YEKEYIZHIJIEZHIXINGYEXIABENGSHIYANFANGFABIAOZHUNDEGUIDING。YIBANCAIYONGNPSH3ZUOWEINPSHrZHI,GB/T3216《HUIZHUANDONGLIYEXIABENGSHUILIXINGNENGYANSHOUSHIYANlJIHE2JI》ZHONGNtXSH3DINGYIWEI:JINXINGZHEIZHONGSHIYANSHI,CAIYONGZHUJIANJIANGDINPSHZHIZHIHENGDINGLIULIANGXIA(DIYIJI)YANGCHENGDEXIAJIANGDADAO3%,CISHIDENPSHZHIJIWEINPSH3.